Recently we have a lot of products that doesn’t let us start a campaign for it, it says that the product is ineligible because it cannot be found on the amazon, but the page is visible, indexed, has rank and stock. Does anyone have this issue as well? What is there to do, the seller support isn’t quite helping.
Check if there are any issues on the Inventory reports and Defect reports. Check buybox.
If all of this is ok, then contact Amazon Advertising support.